SCHEDULED MAINTENANCE
Metal dispersions on zirconium phosphates. Part 2.—Hydrogen reduction of silver(I)-exchanged α-zirconium phosphate
Abstract
The kinetics of the reduction by hydrogen of Ag+ ions in α-zirconium phosphate and the formation of silver particles have been studied. Reduction proceeded under relatively mild conditions. The time dependence of the percentage of Ag+ ions reduced in this reaction is always expressed by an S-shaped curve with a maximum reaction rate at ca. 15% conversion. An initial induction period was observed and is suggested to result from the extremely slow rate of initiating silver nuclei. The remainder of the reaction rate was found to conform to an Elovich-typed equation. The initial rate was found to be directly proportional to the Ag+ loading and to the surface area of the support but proportional to the half-power of the hydrogen pressure. It is also suggested that the reduction reaction occurs on the surface with the reaction itself determining the rate after the induction period.
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